MSC solves issues with fossils and asexual organisms 
LSC uses genetic similarity/differences to determine species but is subjective in the magnitude of differences needed. 
Hawaiian islands form through time. Fruit flies from one population migrate to a new island (physical separation) and have formed many new species 
The Atlantic and Pacific oceans used to connect before what we call Panama arose from the ocean. Different shrimp species live at different depths (colors on the picture). As Panama split the ocean these populations (by depth) became isolated and formed different species. The deep species (red) on opposite sides are more different than shallow species (green) because they have been separated longer!! 
